libcharconv_crop_marks.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59

/* See LICENSE file for copyright and license details. */
#include "lib-common.h"


enum libcharconv_result
libcharconv_crop_marks(const char *s, size_t slen, size_t *n, uint_least32_t *cp, size_t *ncp)
{
	uint_least32_t c;
	*n = 0;
	for (; slen--; s++) {
		if (s[0] == '|') {
			if (!slen)
				goto indeterminate;
			if (s[1] == '-')
				c = UINT32_C(0x230C);
			else if (s[1] == '_')
				c = UINT32_C(0x230E);
			else
				goto no_conv;
			goto conv;
		} else if (s[0] == '-') {
			if (!slen)
				goto indeterminate;
			if (s[1] != '|')
				goto no_conv;
			c = UINT32_C(0x230D);
			goto conv;
		} else if (s[0] == '_') {
			if (!slen)
				goto indeterminate;
			if (s[1] != '|')
				goto no_conv;
			c = UINT32_C(0x230F);
			goto conv;
		} else {
			*n += 1u;
		}
	}
	return LIBCHARCONV_NO_CONVERT;

no_conv:
	if (!*n)
		*n = 1u;
	return LIBCHARCONV_NO_CONVERT;

indeterminate:
	if (*n)
		goto no_conv;
	return LIBCHARCONV_INDETERMINATE;

conv:
	if (*n)
		goto no_conv;
	if (*ncp)
		*cp = c;
	*n += 2u;
	*ncp = 1u;
	return LIBCHARCONV_CONVERTED;
}